1 /*- 2 * Copyright (c) 2000 Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 /* 33 * The following copyright applies to the base64 code: 34 * 35 *- 36 * Copyright 1997 Massachusetts Institute of Technology 37 * 38 * Permission to use, copy, modify, and distribute this software and 39 * its documentation for any purpose and without fee is hereby 40 * granted, provided that both the above copyright notice and this 41 * permission notice appear in all copies, that both the above 42 * copyright notice and this permission notice appear in all 43 * supporting documentation, and that the name of M.I.T. not be used 44 * in advertising or publicity pertaining to distribution of the 45 * software without specific, written prior permission. M.I.T. makes 46 * no representations about the suitability of this software for any 47 * purpose. It is provided "as is" without express or implied 48 * warranty. 49 * 50 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 51 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 52 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 53 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 54 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 57 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 58 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 59 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 60 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64 #include <sys/param.h> 65 #include <sys/socket.h> 66 67 #include <ctype.h> 68 #include <err.h> 69 #include <errno.h> 70 #include <locale.h> 71 #include <netdb.h> 72 #include <stdarg.h> 73 #include <stdio.h> 74 #include <stdlib.h> 75 #include <string.h> 76 #include <time.h> 77 #include <unistd.h> 78 79 #include "fetch.h" 80 #include "common.h" 81 #include "httperr.h" 82 83 /* Maximum number of redirects to follow */ 84 #define MAX_REDIRECT 5 85 86 /* Symbolic names for reply codes we care about */ 87 #define HTTP_OK 200 88 #define HTTP_PARTIAL 206 89 #define HTTP_MOVED_PERM 301 90 #define HTTP_MOVED_TEMP 302 91 #define HTTP_SEE_OTHER 303 92 #define HTTP_NEED_AUTH 401 93 #define HTTP_NEED_PROXY_AUTH 407 94 #define HTTP_BAD_RANGE 416 95 #define HTTP_PROTOCOL_ERROR 999 96 97 #define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \ 98 || (xyz) == HTTP_MOVED_TEMP \ 99 || (xyz) == HTTP_SEE_OTHER) 100 101 #define HTTP_ERROR(xyz) ((xyz) > 400 && (xyz) < 599) 102 103 104 /***************************************************************************** 105 * I/O functions for decoding chunked streams 106 */ 107 108 struct httpio 109 { 110 conn_t *conn; /* connection */ 111 int chunked; /* chunked mode */ 112 char *buf; /* chunk buffer */ 113 size_t bufsize; /* size of chunk buffer */ 114 ssize_t buflen; /* amount of data currently in buffer */ 115 int bufpos; /* current read offset in buffer */ 116 int eof; /* end-of-file flag */ 117 int error; /* error flag */ 118 size_t chunksize; /* remaining size of current chunk */ 119 #ifndef NDEBUG 120 size_t total; 121 #endif 122 }; 123 124 /* 125 * Get next chunk header 126 */ 127 static int 128 _http_new_chunk(struct httpio *io) 129 { 130 char *p; 131 132 if (_fetch_getln(io->conn) == -1) 133 return (-1); 134 135 if (io->conn->buflen < 2 || !ishexnumber(*io->conn->buf)) 136 return (-1); 137 138 for (p = io->conn->buf; *p && !isspace(*p); ++p) { 139 if (*p == ';') 140 break; 141 if (!ishexnumber(*p)) 142 return (-1); 143 if (isdigit(*p)) { 144 io->chunksize = io->chunksize * 16 + 145 *p - '0'; 146 } else { 147 io->chunksize = io->chunksize * 16 + 148 10 + tolower(*p) - 'a'; 149 } 150 } 151 152 #ifndef NDEBUG 153 if (fetchDebug) { 154 io->total += io->chunksize; 155 if (io->chunksize == 0) 156 fprintf(stderr, "%s(): end of last chunk\n", __func__); 157 else 158 fprintf(stderr, "%s(): new chunk: %lu (%lu)\n", 159 __func__, (unsigned long)io->chunksize, 160 (unsigned long)io->total); 161 } 162 #endif 163 164 return (io->chunksize); 165 } 166 167 /* 168 * Grow the input buffer to at least len bytes 169 */ 170 static inline int 171 _http_growbuf(struct httpio *io, size_t len) 172 { 173 char *tmp; 174 175 if (io->bufsize >= len) 176 return (0); 177 178 if ((tmp = realloc(io->buf, len)) == NULL) 179 return (-1); 180 io->buf = tmp; 181 io->bufsize = len; 182 return (0); 183 } 184 185 /* 186 * Fill the input buffer, do chunk decoding on the fly 187 */ 188 static int 189 _http_fillbuf(struct httpio *io, size_t len) 190 { 191 if (io->error) 192 return (-1); 193 if (io->eof) 194 return (0); 195 196 if (io->chunked == 0) { 197 if (_http_growbuf(io, len) == -1) 198 return (-1); 199 if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1) { 200 io->error = 1; 201 return (-1); 202 } 203 io->bufpos = 0; 204 return (io->buflen); 205 } 206 207 if (io->chunksize == 0) { 208 switch (_http_new_chunk(io)) { 209 case -1: 210 io->error = 1; 211 return (-1); 212 case 0: 213 io->eof = 1; 214 return (0); 215 } 216 } 217 218 if (len > io->chunksize) 219 len = io->chunksize; 220 if (_http_growbuf(io, len) == -1) 221 return (-1); 222 if ((io->buflen = _fetch_read(io->conn, io->buf, len)) == -1) { 223 io->error = 1; 224 return (-1); 225 } 226 io->chunksize -= io->buflen; 227 228 if (io->chunksize == 0) { 229 char endl[2]; 230 231 if (_fetch_read(io->conn, endl, 2) != 2 || 232 endl[0] != '\r' || endl[1] != '\n') 233 return (-1); 234 } 235 236 io->bufpos = 0; 237 238 return (io->buflen); 239 } 240 241 /* 242 * Read function 243 */ 244 static int 245 _http_readfn(void *v, char *buf, int len) 246 { 247 struct httpio *io = (struct httpio *)v; 248 int l, pos; 249 250 if (io->error) 251 return (-1); 252 if (io->eof) 253 return (0); 254 255 for (pos = 0; len > 0; pos += l, len -= l) { 256 /* empty buffer */ 257 if (!io->buf || io->bufpos == io->buflen) 258 if (_http_fillbuf(io, len) < 1) 259 break; 260 l = io->buflen - io->bufpos; 261 if (len < l) 262 l = len; 263 bcopy(io->buf + io->bufpos, buf + pos, l); 264 io->bufpos += l; 265 } 266 267 if (!pos && io->error) 268 return (-1); 269 return (pos); 270 } 271 272 /* 273 * Write function 274 */ 275 static int 276 _http_writefn(void *v, const char *buf, int len) 277 { 278 struct httpio *io = (struct httpio *)v; 279 280 return (_fetch_write(io->conn, buf, len)); 281 } 282 283 /* 284 * Close function 285 */ 286 static int 287 _http_closefn(void *v) 288 { 289 struct httpio *io = (struct httpio *)v; 290 int r; 291 292 r = _fetch_close(io->conn); 293 if (io->buf) 294 free(io->buf); 295 free(io); 296 return (r); 297 } 298 299 /* 300 * Wrap a file descriptor up 301 */ 302 static FILE * 303 _http_funopen(conn_t *conn, int chunked) 304 { 305 struct httpio *io; 306 FILE *f; 307 308 if ((io = calloc(1, sizeof(*io))) == NULL) { 309 _fetch_syserr(); 310 return (NULL); 311 } 312 io->conn = conn; 313 io->chunked = chunked; 314 f = funopen(io, _http_readfn, _http_writefn, NULL, _http_closefn); 315 if (f == NULL) { 316 _fetch_syserr(); 317 free(io); 318 return (NULL); 319 } 320 return (f); 321 } 322 323 324 /***************************************************************************** 325 * Helper functions for talking to the server and parsing its replies 326 */ 327 328 /* Header types */ 329 typedef enum { 330 hdr_syserror = -2, 331 hdr_error = -1, 332 hdr_end = 0, 333 hdr_unknown = 1, 334 hdr_content_length, 335 hdr_content_range, 336 hdr_last_modified, 337 hdr_location, 338 hdr_transfer_encoding, 339 hdr_www_authenticate 340 } hdr_t; 341 342 /* Names of interesting headers */ 343 static struct { 344 hdr_t num; 345 const char *name; 346 } hdr_names[] = { 347 { hdr_content_length, "Content-Length" }, 348 { hdr_content_range, "Content-Range" }, 349 { hdr_last_modified, "Last-Modified" }, 350 { hdr_location, "Location" }, 351 { hdr_transfer_encoding, "Transfer-Encoding" }, 352 { hdr_www_authenticate, "WWW-Authenticate" }, 353 { hdr_unknown, NULL }, 354 }; 355 356 /* 357 * Send a formatted line; optionally echo to terminal 358 */ 359 static int 360 _http_cmd(conn_t *conn, const char *fmt, ...) 361 { 362 va_list ap; 363 size_t len; 364 char *msg; 365 int r; 366 367 va_start(ap, fmt); 368 len = vasprintf(&msg, fmt, ap); 369 va_end(ap); 370 371 if (msg == NULL) { 372 errno = ENOMEM; 373 _fetch_syserr(); 374 return (-1); 375 } 376 377 r = _fetch_putln(conn, msg, len); 378 free(msg); 379 380 if (r == -1) { 381 _fetch_syserr(); 382 return (-1); 383 } 384 385 return (0); 386 } 387 388 /* 389 * Get and parse status line 390 */ 391 static int 392 _http_get_reply(conn_t *conn) 393 { 394 char *p; 395 396 if (_fetch_getln(conn) == -1) 397 return (-1); 398 /* 399 * A valid status line looks like "HTTP/m.n xyz reason" where m 400 * and n are the major and minor protocol version numbers and xyz 401 * is the reply code. 402 * Unfortunately, there are servers out there (NCSA 1.5.1, to name 403 * just one) that do not send a version number, so we can't rely 404 * on finding one, but if we do, insist on it being 1.0 or 1.1. 405 * We don't care about the reason phrase. 406 */ 407 if (strncmp(conn->buf, "HTTP", 4) != 0) 408 return (HTTP_PROTOCOL_ERROR); 409 p = conn->buf + 4; 410 if (*p == '/') { 411 if (p[1] != '1' || p[2] != '.' || (p[3] != '0' && p[3] != '1')) 412 return (HTTP_PROTOCOL_ERROR); 413 p += 4; 414 } 415 if (*p != ' ' || !isdigit(p[1]) || !isdigit(p[2]) || !isdigit(p[3])) 416 return (HTTP_PROTOCOL_ERROR); 417 418 conn->err = (p[1] - '0') * 100 + (p[2] - '0') * 10 + (p[3] - '0'); 419 return (conn->err); 420 } 421 422 /* 423 * Check a header; if the type matches the given string, return a pointer 424 * to the beginning of the value. 425 */ 426 static const char * 427 _http_match(const char *str, const char *hdr) 428 { 429 while (*str && *hdr && tolower(*str++) == tolower(*hdr++)) 430 /* nothing */; 431 if (*str || *hdr != ':') 432 return (NULL); 433 while (*hdr && isspace(*++hdr)) 434 /* nothing */; 435 return (hdr); 436 } 437 438 /* 439 * Get the next header and return the appropriate symbolic code. 440 */ 441 static hdr_t 442 _http_next_header(conn_t *conn, const char **p) 443 { 444 int i; 445 446 if (_fetch_getln(conn) == -1) 447 return (hdr_syserror); 448 while (conn->buflen && isspace(conn->buf[conn->buflen - 1])) 449 conn->buflen--; 450 conn->buf[conn->buflen] = '\0'; 451 if (conn->buflen == 0) 452 return (hdr_end); 453 /* 454 * We could check for malformed headers but we don't really care. 455 * A valid header starts with a token immediately followed by a 456 * colon; a token is any sequence of non-control, non-whitespace 457 * characters except "()<>@,;:\\\"{}". 458 */ 459 for (i = 0; hdr_names[i].num != hdr_unknown; i++) 460 if ((*p = _http_match(hdr_names[i].name, conn->buf)) != NULL) 461 return (hdr_names[i].num); 462 return (hdr_unknown); 463 } 464 465 /* 466 * Parse a last-modified header 467 */ 468 static int 469 _http_parse_mtime(const char *p, time_t *mtime) 470 { 471 char locale[64], *r; 472 struct tm tm; 473 474 strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale)); 475 setlocale(LC_TIME, "C"); 476 r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm); 477 /* XXX should add support for date-2 and date-3 */ 478 setlocale(LC_TIME, locale); 479 if (r == NULL) 480 return (-1); 481 DEBUG(fprintf(stderr, "last modified: [%04d-%02d-%02d " 482 "%02d:%02d:%02d]\n", 483 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 484 tm.tm_hour, tm.tm_min, tm.tm_sec)); 485 *mtime = timegm(&tm); 486 return (0); 487 } 488 489 /* 490 * Parse a content-length header 491 */ 492 static int 493 _http_parse_length(const char *p, off_t *length) 494 { 495 off_t len; 496 497 for (len = 0; *p && isdigit(*p); ++p) 498 len = len * 10 + (*p - '0'); 499 if (*p) 500 return (-1); 501 DEBUG(fprintf(stderr, "content length: [%lld]\n", 502 (long long)len)); 503 *length = len; 504 return (0); 505 } 506 507 /* 508 * Parse a content-range header 509 */ 510 static int 511 _http_parse_range(const char *p, off_t *offset, off_t *length, off_t *size) 512 { 513 off_t first, last, len; 514 515 if (strncasecmp(p, "bytes ", 6) != 0) 516 return (-1); 517 p += 6; 518 if (*p == '*') { 519 first = last = -1; 520 ++p; 521 } else { 522 for (first = 0; *p && isdigit(*p); ++p) 523 first = first * 10 + *p - '0'; 524 if (*p != '-') 525 return (-1); 526 for (last = 0, ++p; *p && isdigit(*p); ++p) 527 last = last * 10 + *p - '0'; 528 } 529 if (first > last || *p != '/') 530 return (-1); 531 for (len = 0, ++p; *p && isdigit(*p); ++p) 532 len = len * 10 + *p - '0'; 533 if (*p || len < last - first + 1) 534 return (-1); 535 if (first == -1) { 536 DEBUG(fprintf(stderr, "content range: [*/%lld]\n", 537 (long long)len)); 538 *length = 0; 539 } else { 540 DEBUG(fprintf(stderr, "content range: [%lld-%lld/%lld]\n", 541 (long long)first, (long long)last, (long long)len)); 542 *length = last - first + 1; 543 } 544 *offset = first; 545 *size = len; 546 return (0); 547 } 548 549 550 /***************************************************************************** 551 * Helper functions for authorization 552 */ 553 554 /* 555 * Base64 encoding 556 */ 557 static char * 558 _http_base64(const char *src) 559 { 560 static const char base64[] = 561 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 562 "abcdefghijklmnopqrstuvwxyz" 563 "0123456789+/"; 564 char *str, *dst; 565 size_t l; 566 int t, r; 567 568 l = strlen(src); 569 if ((str = malloc(((l + 2) / 3) * 4)) == NULL) 570 return (NULL); 571 dst = str; 572 r = 0; 573 574 while (l >= 3) { 575 t = (src[0] << 16) | (src[1] << 8) | src[2]; 576 dst[0] = base64[(t >> 18) & 0x3f]; 577 dst[1] = base64[(t >> 12) & 0x3f]; 578 dst[2] = base64[(t >> 6) & 0x3f]; 579 dst[3] = base64[(t >> 0) & 0x3f]; 580 src += 3; l -= 3; 581 dst += 4; r += 4; 582 } 583 584 switch (l) { 585 case 2: 586 t = (src[0] << 16) | (src[1] << 8); 587 dst[0] = base64[(t >> 18) & 0x3f]; 588 dst[1] = base64[(t >> 12) & 0x3f]; 589 dst[2] = base64[(t >> 6) & 0x3f]; 590 dst[3] = '='; 591 dst += 4; 592 r += 4; 593 break; 594 case 1: 595 t = src[0] << 16; 596 dst[0] = base64[(t >> 18) & 0x3f]; 597 dst[1] = base64[(t >> 12) & 0x3f]; 598 dst[2] = dst[3] = '='; 599 dst += 4; 600 r += 4; 601 break; 602 case 0: 603 break; 604 } 605 606 *dst = 0; 607 return (str); 608 } 609 610 /* 611 * Encode username and password 612 */ 613 static int 614 _http_basic_auth(conn_t *conn, const char *hdr, const char *usr, const char *pwd) 615 { 616 char *upw, *auth; 617 int r; 618 619 DEBUG(fprintf(stderr, "usr: [%s]\n", usr)); 620 DEBUG(fprintf(stderr, "pwd: [%s]\n", pwd)); 621 if (asprintf(&upw, "%s:%s", usr, pwd) == -1) 622 return (-1); 623 auth = _http_base64(upw); 624 free(upw); 625 if (auth == NULL) 626 return (-1); 627 r = _http_cmd(conn, "%s: Basic %s", hdr, auth); 628 free(auth); 629 return (r); 630 } 631 632 /* 633 * Send an authorization header 634 */ 635 static int 636 _http_authorize(conn_t *conn, const char *hdr, const char *p) 637 { 638 /* basic authorization */ 639 if (strncasecmp(p, "basic:", 6) == 0) { 640 char *user, *pwd, *str; 641 int r; 642 643 /* skip realm */ 644 for (p += 6; *p && *p != ':'; ++p) 645 /* nothing */ ; 646 if (!*p || strchr(++p, ':') == NULL) 647 return (-1); 648 if ((str = strdup(p)) == NULL) 649 return (-1); /* XXX */ 650 user = str; 651 pwd = strchr(str, ':'); 652 *pwd++ = '\0'; 653 r = _http_basic_auth(conn, hdr, user, pwd); 654 free(str); 655 return (r); 656 } 657 return (-1); 658 } 659 660 661 /***************************************************************************** 662 * Helper functions for connecting to a server or proxy 663 */ 664 665 /* 666 * Connect to the correct HTTP server or proxy. 667 */ 668 static conn_t * 669 _http_connect(struct url *URL, struct url *purl, const char *flags) 670 { 671 conn_t *conn; 672 int verbose; 673 int af; 674 675 #ifdef INET6 676 af = AF_UNSPEC; 677 #else 678 af = AF_INET; 679 #endif 680 681 verbose = CHECK_FLAG('v'); 682 if (CHECK_FLAG('4')) 683 af = AF_INET; 684 #ifdef INET6 685 else if (CHECK_FLAG('6')) 686 af = AF_INET6; 687 #endif 688 689 if (purl && strcasecmp(URL->scheme, SCHEME_HTTPS) != 0) { 690 URL = purl; 691 } else if (strcasecmp(URL->scheme, SCHEME_FTP) == 0) { 692 /* can't talk http to an ftp server */ 693 /* XXX should set an error code */ 694 return (NULL); 695 } 696 697 if ((conn = _fetch_connect(URL->host, URL->port, af, verbose)) == NULL) 698 /* _fetch_connect() has already set an error code */ 699 return (NULL); 700 if (strcasecmp(URL->scheme, SCHEME_HTTPS) == 0 && 701 _fetch_ssl(conn, verbose) == -1) { 702 _fetch_close(conn); 703 /* grrr */ 704 errno = EAUTH; 705 _fetch_syserr(); 706 return (NULL); 707 } 708 return (conn); 709 } 710 711 static struct url * 712 _http_get_proxy(const char *flags) 713 { 714 struct url *purl; 715 char *p; 716 717 if (flags != NULL && strchr(flags, 'd') != NULL) 718 return (NULL); 719 if (((p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) && 720 (purl = fetchParseURL(p))) { 721 if (!*purl->scheme) 722 strcpy(purl->scheme, SCHEME_HTTP); 723 if (!purl->port) 724 purl->port = _fetch_default_proxy_port(purl->scheme); 725 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) 726 return (purl); 727 fetchFreeURL(purl); 728 } 729 return (NULL); 730 } 731 732 static void 733 _http_print_html(FILE *out, FILE *in) 734 { 735 size_t len; 736 char *line, *p, *q; 737 int comment, tag; 738 739 comment = tag = 0; 740 while ((line = fgetln(in, &len)) != NULL) { 741 while (len && isspace(line[len - 1])) 742 --len; 743 for (p = q = line; q < line + len; ++q) { 744 if (comment && *q == '-') { 745 if (q + 2 < line + len && 746 strcmp(q, "-->") == 0) { 747 tag = comment = 0; 748 q += 2; 749 } 750 } else if (tag && !comment && *q == '>') { 751 p = q + 1; 752 tag = 0; 753 } else if (!tag && *q == '<') { 754 if (q > p) 755 fwrite(p, q - p, 1, out); 756 tag = 1; 757 if (q + 3 < line + len && 758 strcmp(q, "<!--") == 0) { 759 comment = 1; 760 q += 3; 761 } 762 } 763 } 764 if (!tag && q > p) 765 fwrite(p, q - p, 1, out); 766 fputc('\n', out); 767 } 768 } 769 770 771 /***************************************************************************** 772 * Core 773 */ 774 775 /* 776 * Send a request and process the reply 777 * 778 * XXX This function is way too long, the do..while loop should be split 779 * XXX off into a separate function. 780 */ 781 FILE * 782 _http_request(struct url *URL, const char *op, struct url_stat *us, 783 struct url *purl, const char *flags) 784 { 785 conn_t *conn; 786 struct url *url, *new; 787 int chunked, direct, need_auth, noredirect, verbose; 788 int e, i, n; 789 off_t offset, clength, length, size; 790 time_t mtime; 791 const char *p; 792 FILE *f; 793 hdr_t h; 794 char hbuf[MAXHOSTNAMELEN + 7], *host; 795 796 direct = CHECK_FLAG('d'); 797 noredirect = CHECK_FLAG('A'); 798 verbose = CHECK_FLAG('v'); 799 800 if (direct && purl) { 801 fetchFreeURL(purl); 802 purl = NULL; 803 } 804 805 /* try the provided URL first */ 806 url = URL; 807 808 /* if the A flag is set, we only get one try */ 809 n = noredirect ? 1 : MAX_REDIRECT; 810 i = 0; 811 812 e = HTTP_PROTOCOL_ERROR; 813 need_auth = 0; 814 do { 815 new = NULL; 816 chunked = 0; 817 offset = 0; 818 clength = -1; 819 length = -1; 820 size = -1; 821 mtime = 0; 822 823 /* check port */ 824 if (!url->port) 825 url->port = _fetch_default_port(url->scheme); 826 827 /* were we redirected to an FTP URL? */ 828 if (purl == NULL && strcmp(url->scheme, SCHEME_FTP) == 0) { 829 if (strcmp(op, "GET") == 0) 830 return (_ftp_request(url, "RETR", us, purl, flags)); 831 else if (strcmp(op, "HEAD") == 0) 832 return (_ftp_request(url, "STAT", us, purl, flags)); 833 } 834 835 /* connect to server or proxy */ 836 if ((conn = _http_connect(url, purl, flags)) == NULL) 837 goto ouch; 838 839 host = url->host; 840 #ifdef INET6 841 if (strchr(url->host, ':')) { 842 snprintf(hbuf, sizeof(hbuf), "[%s]", url->host); 843 host = hbuf; 844 } 845 #endif 846 if (url->port != _fetch_default_port(url->scheme)) { 847 if (host != hbuf) { 848 strcpy(hbuf, host); 849 host = hbuf; 850 } 851 snprintf(hbuf + strlen(hbuf), 852 sizeof(hbuf) - strlen(hbuf), ":%d", url->port); 853 } 854 855 /* send request */ 856 if (verbose) 857 _fetch_info("requesting %s://%s%s", 858 url->scheme, host, url->doc); 859 if (purl) { 860 _http_cmd(conn, "%s %s://%s%s HTTP/1.1", 861 op, url->scheme, host, url->doc); 862 } else { 863 _http_cmd(conn, "%s %s HTTP/1.1", 864 op, url->doc); 865 } 866 867 /* virtual host */ 868 _http_cmd(conn, "Host: %s", host); 869 870 /* proxy authorization */ 871 if (purl) { 872 if (*purl->user || *purl->pwd) 873 _http_basic_auth(conn, "Proxy-Authorization", 874 purl->user, purl->pwd); 875 else if ((p = getenv("HTTP_PROXY_AUTH")) != NULL && *p != '\0') 876 _http_authorize(conn, "Proxy-Authorization", p); 877 } 878 879 /* server authorization */ 880 if (need_auth || *url->user || *url->pwd) { 881 if (*url->user || *url->pwd) 882 _http_basic_auth(conn, "Authorization", url->user, url->pwd); 883 else if ((p = getenv("HTTP_AUTH")) != NULL && *p != '\0') 884 _http_authorize(conn, "Authorization", p); 885 else if (fetchAuthMethod && fetchAuthMethod(url) == 0) { 886 _http_basic_auth(conn, "Authorization", url->user, url->pwd); 887 } else { 888 _http_seterr(HTTP_NEED_AUTH); 889 goto ouch; 890 } 891 } 892 893 /* other headers */ 894 if ((p = getenv("HTTP_REFERER")) != NULL && *p != '\0') { 895 if (strcasecmp(p, "auto") == 0) 896 _http_cmd(conn, "Referer: %s://%s%s", 897 url->scheme, host, url->doc); 898 else 899 _http_cmd(conn, "Referer: %s", p); 900 } 901 if ((p = getenv("HTTP_USER_AGENT")) != NULL && *p != '\0') 902 _http_cmd(conn, "User-Agent: %s", p); 903 else 904 _http_cmd(conn, "User-Agent: %s " _LIBFETCH_VER, getprogname()); 905 if (url->offset > 0) 906 _http_cmd(conn, "Range: bytes=%lld-", (long long)url->offset); 907 _http_cmd(conn, "Connection: close"); 908 _http_cmd(conn, ""); 909 910 /* get reply */ 911 switch (_http_get_reply(conn)) { 912 case HTTP_OK: 913 case HTTP_PARTIAL: 914 /* fine */ 915 break; 916 case HTTP_MOVED_PERM: 917 case HTTP_MOVED_TEMP: 918 case HTTP_SEE_OTHER: 919 /* 920 * Not so fine, but we still have to read the 921 * headers to get the new location. 922 */ 923 break; 924 case HTTP_NEED_AUTH: 925 if (need_auth) { 926 /* 927 * We already sent out authorization code, 928 * so there's nothing more we can do. 929 */ 930 _http_seterr(conn->err); 931 goto ouch; 932 } 933 /* try again, but send the password this time */ 934 if (verbose) 935 _fetch_info("server requires authorization"); 936 break; 937 case HTTP_NEED_PROXY_AUTH: 938 /* 939 * If we're talking to a proxy, we already sent 940 * our proxy authorization code, so there's 941 * nothing more we can do. 942 */ 943 _http_seterr(conn->err); 944 goto ouch; 945 case HTTP_BAD_RANGE: 946 /* 947 * This can happen if we ask for 0 bytes because 948 * we already have the whole file. Consider this 949 * a success for now, and check sizes later. 950 */ 951 break; 952 case HTTP_PROTOCOL_ERROR: 953 /* fall through */ 954 case -1: 955 _fetch_syserr(); 956 goto ouch; 957 default: 958 _http_seterr(conn->err); 959 if (!verbose) 960 goto ouch; 961 /* fall through so we can get the full error message */ 962 } 963 964 /* get headers */ 965 do { 966 switch ((h = _http_next_header(conn, &p))) { 967 case hdr_syserror: 968 _fetch_syserr(); 969 goto ouch; 970 case hdr_error: 971 _http_seterr(HTTP_PROTOCOL_ERROR); 972 goto ouch; 973 case hdr_content_length: 974 _http_parse_length(p, &clength); 975 break; 976 case hdr_content_range: 977 _http_parse_range(p, &offset, &length, &size); 978 break; 979 case hdr_last_modified: 980 _http_parse_mtime(p, &mtime); 981 break; 982 case hdr_location: 983 if (!HTTP_REDIRECT(conn->err)) 984 break; 985 if (new) 986 free(new); 987 if (verbose) 988 _fetch_info("%d redirect to %s", conn->err, p); 989 if (*p == '/') 990 /* absolute path */ 991 new = fetchMakeURL(url->scheme, url->host, url->port, p, 992 url->user, url->pwd); 993 else 994 new = fetchParseURL(p); 995 if (new == NULL) { 996 /* XXX should set an error code */ 997 DEBUG(fprintf(stderr, "failed to parse new URL\n")); 998 goto ouch; 999 } 1000 if (!*new->user && !*new->pwd) { 1001 strcpy(new->user, url->user); 1002 strcpy(new->pwd, url->pwd); 1003 } 1004 new->offset = url->offset; 1005 new->length = url->length; 1006 break; 1007 case hdr_transfer_encoding: 1008 /* XXX weak test*/ 1009 chunked = (strcasecmp(p, "chunked") == 0); 1010 break; 1011 case hdr_www_authenticate: 1012 if (conn->err != HTTP_NEED_AUTH) 1013 break; 1014 /* if we were smarter, we'd check the method and realm */ 1015 break; 1016 case hdr_end: 1017 /* fall through */ 1018 case hdr_unknown: 1019 /* ignore */ 1020 break; 1021 } 1022 } while (h > hdr_end); 1023 1024 /* we need to provide authentication */ 1025 if (conn->err == HTTP_NEED_AUTH) { 1026 e = conn->err; 1027 need_auth = 1; 1028 _fetch_close(conn); 1029 conn = NULL; 1030 continue; 1031 } 1032 1033 /* requested range not satisfiable */ 1034 if (conn->err == HTTP_BAD_RANGE) { 1035 if (url->offset == size && url->length == 0) { 1036 /* asked for 0 bytes; fake it */ 1037 offset = url->offset; 1038 conn->err = HTTP_OK; 1039 break; 1040 } else { 1041 _http_seterr(conn->err); 1042 goto ouch; 1043 } 1044 } 1045 1046 /* we have a hit or an error */ 1047 if (conn->err == HTTP_OK || conn->err == HTTP_PARTIAL || HTTP_ERROR(conn->err)) 1048 break; 1049 1050 /* all other cases: we got a redirect */ 1051 e = conn->err; 1052 need_auth = 0; 1053 _fetch_close(conn); 1054 conn = NULL; 1055 if (!new) { 1056 DEBUG(fprintf(stderr, "redirect with no new location\n")); 1057 break; 1058 } 1059 if (url != URL) 1060 fetchFreeURL(url); 1061 url = new; 1062 } while (++i < n); 1063 1064 /* we failed, or ran out of retries */ 1065 if (conn == NULL) { 1066 _http_seterr(e); 1067 goto ouch; 1068 } 1069 1070 DEBUG(fprintf(stderr, "offset %lld, length %lld," 1071 " size %lld, clength %lld\n", 1072 (long long)offset, (long long)length, 1073 (long long)size, (long long)clength)); 1074 1075 /* check for inconsistencies */ 1076 if (clength != -1 && length != -1 && clength != length) { 1077 _http_seterr(HTTP_PROTOCOL_ERROR); 1078 goto ouch; 1079 } 1080 if (clength == -1) 1081 clength = length; 1082 if (clength != -1) 1083 length = offset + clength; 1084 if (length != -1 && size != -1 && length != size) { 1085 _http_seterr(HTTP_PROTOCOL_ERROR); 1086 goto ouch; 1087 } 1088 if (size == -1) 1089 size = length; 1090 1091 /* fill in stats */ 1092 if (us) { 1093 us->size = size; 1094 us->atime = us->mtime = mtime; 1095 } 1096 1097 /* too far? */ 1098 if (URL->offset > 0 && offset > URL->offset) { 1099 _http_seterr(HTTP_PROTOCOL_ERROR); 1100 goto ouch; 1101 } 1102 1103 /* report back real offset and size */ 1104 URL->offset = offset; 1105 URL->length = clength; 1106 1107 /* wrap it up in a FILE */ 1108 if ((f = _http_funopen(conn, chunked)) == NULL) { 1109 _fetch_syserr(); 1110 goto ouch; 1111 } 1112 1113 if (url != URL) 1114 fetchFreeURL(url); 1115 if (purl) 1116 fetchFreeURL(purl); 1117 1118 if (HTTP_ERROR(conn->err)) { 1119 _http_print_html(stderr, f); 1120 fclose(f); 1121 f = NULL; 1122 } 1123 1124 return (f); 1125 1126 ouch: 1127 if (url != URL) 1128 fetchFreeURL(url); 1129 if (purl) 1130 fetchFreeURL(purl); 1131 if (conn != NULL) 1132 _fetch_close(conn); 1133 return (NULL); 1134 } 1135 1136 1137 /***************************************************************************** 1138 * Entry points 1139 */ 1140 1141 /* 1142 * Retrieve and stat a file by HTTP 1143 */ 1144 FILE * 1145 fetchXGetHTTP(struct url *URL, struct url_stat *us, const char *flags) 1146 { 1147 return (_http_request(URL, "GET", us, _http_get_proxy(flags), flags)); 1148 } 1149 1150 /* 1151 * Retrieve a file by HTTP 1152 */ 1153 FILE * 1154 fetchGetHTTP(struct url *URL, const char *flags) 1155 { 1156 return (fetchXGetHTTP(URL, NULL, flags)); 1157 } 1158 1159 /* 1160 * Store a file by HTTP 1161 */ 1162 FILE * 1163 fetchPutHTTP(struct url *URL __unused, const char *flags __unused) 1164 { 1165 warnx("fetchPutHTTP(): not implemented"); 1166 return (NULL); 1167 } 1168 1169 /* 1170 * Get an HTTP document's metadata 1171 */ 1172 int 1173 fetchStatHTTP(struct url *URL, struct url_stat *us, const char *flags) 1174 { 1175 FILE *f; 1176 1177 f = _http_request(URL, "HEAD", us, _http_get_proxy(flags), flags); 1178 if (f == NULL) 1179 return (-1); 1180 fclose(f); 1181 return (0); 1182 } 1183 1184 /* 1185 * List a directory 1186 */ 1187 struct url_ent * 1188 fetchListHTTP(struct url *url __unused, const char *flags __unused) 1189 { 1190 warnx("fetchListHTTP(): not implemented"); 1191 return (NULL); 1192 } 1193